c06fb25d1f
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52 lines
1.7 KiB
Diff
52 lines
1.7 KiB
Diff
From 9c9330a7ad5dab82517a3f712099f54a4a1a6f3e Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 14 Mar 2024 15:25:19 +0000
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Subject: [PATCH 0963/1085] dtoverlays: Add a disconnect_on_idle override to
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i2c-mux
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When running multiple muxes, in order to be able to reuse the
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same address on child buses of different muxes you have to
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disconnect the mux after every transaction.
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Add an override to select that option.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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arch/arm/boot/dts/overlays/README | 3 +++
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arch/arm/boot/dts/overlays/i2c-mux-overlay.dts | 6 ++++++
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2 files changed, 9 insertions(+)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -2042,6 +2042,9 @@ Params: pca9542 Select t
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i2c6 Choose the I2C6 bus (configure with the i2c6
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overlay - BCM2711 only)
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+ disconnect_on_idle Force the mux to disconnect all child buses
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+ after every transaction.
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+
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[ The i2c-mux-pca9548a overlay has been deleted. See i2c-mux. ]
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--- a/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/i2c-mux-overlay.dts
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@@ -3,6 +3,8 @@
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/dts-v1/;
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/plugin/;
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+#include <dt-bindings/mux/mux.h>
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+
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/{
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compatible = "brcm,bcm2835";
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@@ -169,5 +171,9 @@
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<&frag100>, "target-path=i2c5";
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i2c6 = <&frag100>, "target?=0",
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<&frag100>, "target-path=i2c6";
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+ disconnect_on_idle =
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+ <&pca9542>,"idle-state:0=", <MUX_IDLE_DISCONNECT>,
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+ <&pca9545>,"idle-state:0=", <MUX_IDLE_DISCONNECT>,
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+ <&pca9548>,"idle-state:0=", <MUX_IDLE_DISCONNECT>;
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};
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};
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